Codeforces
- 1208A - XORinacci
- 339A- Helpful Maths.
- 344A - Magnets.
- 404A - Valera and X.
- 405A - Gravity Flip.
- 41A - Translation.
- 427A - Police Recruits.
- 431A - Black Square
- 43A - Football.
- 443A- Anton and Letters.
- 469A - I Wanna Be the Guy.
- 474A - Keyboard
- 318A - Even Odds.
- 294A - Shaass and Oskols.
- 282A - Bit++.
- 136A - Presents.
- 158A - Next Round.
- 381A - Sereja and Dima.
- 208A - Dubstep.
- 231A - Team.
- 236A - Boy or Girl.
- 263A - Beautiful Matrix.
- 265A - Colorful Stones (Simplified Edition).
- 266A - Stones on the Table
- 268A - Games.
- 281A - Word Capitalization.
- 486A - Calculating Function
- 490A - Team Olympiad
- 71A - Way Too Long Words.
- 731A - Night at the Museum
- 732A - Buy a Shovel
- 734A - Anton and Danik
- 742A - Arpa’s hard exam and Mehrdad’s naive cheat
- 766A - Mahmoud and Longest Uncommon Subsequence
- 767A - Snacktower
- 768A - Oath of the Nights Watch
- 770A - New Password
- 791A - Bear and Big Brother
- 807A - Is it rated
- 709A - Juicer.
- 707A - Brains Photos.
- 69A - Young Physicist.
- 496A - Minimum Difficulty
- 9A - Die Roll.
- 520A - Pangram
- 522A - Reposts.
- 556A - Case of the Zeros and Ones
- 567A - Lineland Mail
- 584A - Olesya and Rodion.
- 599A - Patrick and Shopping
- 59A - Word.
- 677A - Vanya and Fence
- 686A - Free Ice Cream
- 950A - Left-handers Right-handers and Ambidexters
- 1005A - Tanya and Stairways
- 1095A - Repeating Cipher
- 1096A - Find Divisible
- 1102A - Integer Sequence Dividing
- 1114A - Got Any Grapes
- 112A - Petya and Strings.
- 1131A - Sea Battle
- 1136A - Nastya Is Reading a Book
- 1139A - Even Substrings
- 1143A - The Doors
- 1144A - Diverse Strings
- 1148A - Another One Bites The Dust
- 1093A - Dice Rolling
- 1092A - Uniform String.
- 1088A - Ehab and another construction problem
- 1006A - Adjacent Replacements
- 1015A - Points in Segments
- 1017A - The Rank
- 1031A - Golden Plate
- 1047A - Little C Loves 3 I
- 1059A - Cashier
- 1060A - Phone Numbers.
- 1064A - Make a triangle
- 1065A - Vasya and Chocolate
- 1077A - Frog Jumping
- 1080A - Petya and Origami
- 1150A - Stock Arbitraging
- 1152A - Neko Finds Grapes
- 1183A - Nearest Interesting Number
- 1185A - Ropewalkers
- 1186A - Vus the Cossack and a Contest
- 118A - String Task.
- 1194A - Remove a Progression
- 1195A - Drinks Choosing
- 1196A - Three Piles of Candies
- 1197A - DIY Wooden Ladder
- 1198A - Keanu Reeves
- 1201A - Important Exam
- 1206A - Choose Two Numbers
- 1207A - There Are Two Types Of Burgers
- 1180A - Alex and a Rhombus
- 1163A-Eating Soup
- 1166A-Silent Classroom
- 1167A - Telephone Number
- 1173A - Nauuo and Votes
- 1159A- A pile of stones
- 1176A - Divide it
- 1178A - Prime Minister
- 1162A-Zoning Restrictions Again
- 1201B - Zero Array
- 1155B - Game with Telephone Numbers
- 463B - Caisa and Pylons
- 102B - Sum of Digits
- 4A - Watermelon.
- 746B - Decoding
- 66B - Petya and Countryside
- 16B - Burglar and Matches
- 1183B - Equalize Prices
- 1092B - Teams Forming
- 680B - Bear and Finding Criminals
- 4B - Before an Exam